Oligocene and Neogene radiolarians from the Labrador Sea
Two sites in the Labrador Sea and one site in Baffin Bay were drilled during Leg 105. Radiolarians were recovered at all three sites, although at Site 645 (Baffin Bay), radiolarians were present in useful numbers only in the mudline sample. Radiolarians of late Neogene age were recovered at Site 646...
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1989
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.744815 https://doi.org/10.1594/PANGAEA.744815 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.744815 2023-05-15T15:35:04+02:00 Oligocene and Neogene radiolarians from the Labrador Sea Lazarus, David B Pallant, Amy MEDIAN LATITUDE: 54.550800 * MEDIAN LONGITUDE: -46.038775 * SOUTH-BOUND LATITUDE: 53.331300 * WEST-BOUND LONGITUDE: -48.369100 * NORTH-BOUND LATITUDE: 58.209300 * EAST-BOUND LONGITUDE: -45.262000 * DATE/TIME START: 1985-10-03T05:45:00 * DATE/TIME END: 1985-10-23T18:15:00 1989-08-30 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.744815 https://doi.org/10.1594/PANGAEA.744815 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.744815 https://doi.org/10.1594/PANGAEA.744815 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Lazarus, David B; Pallant, Amy (1989): Oligocene and Neogene radiolarians from the Labrador Sea: ODP Leg 105. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 349-380, https://doi.org/10.2973/odp.proc.sr.105.125.1989 105-646A 105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP Dataset 1989 ftpangaea https://doi.org/10.1594/PANGAEA.744815 https://doi.org/10.2973/odp.proc.sr.105.125.1989 2023-01-20T07:31:53Z Two sites in the Labrador Sea and one site in Baffin Bay were drilled during Leg 105. Radiolarians were recovered at all three sites, although at Site 645 (Baffin Bay), radiolarians were present in useful numbers only in the mudline sample. Radiolarians of late Neogene age were recovered at Site 646 south of Greenland, while early Oligocene and early Miocene radiolarians were recovered from the Labrador Sea at Site 647. In Site 646, radiolarian and other coarse-fraction abundances vary dramatically from sample to sample and may reflect deep-water depositional processes as well as changes in surface-water conditions. Site 647 siliceous microfossils reach their peak abundance and preservation in Core 105-647A-25R and decline gradually upward into the lower Miocene (Cores 105-647A-13R and -14R). Siliceous microfossil abundances in counts of the > 38-µm Carbonate-free coarse fraction from the siliceous interval are correlated to each other, but not to the abundance of nonbiogenic coarse-fraction components. Radiolarian abundances in specimens per gram (but not diatom abundances) are correlated to bulk opal concentration and to the organic carbon content of the sediment. The abundance of radiolarians and other siliceous microfossils within the lower Oligocene to lower Miocene is interpreted as reflecting changes in surface-water productivity. With only a few exceptions, no stratigraphic indicator species were seen in samples from either Site 646 or Site 647. The absence of both tropical/subtropical and Norwegian-Greenland Sea stratigraphic forms is due to the dominance of subarctic North Atlantic taxa in Leg 105 assemblages. The early Oligocene and early Miocene assemblages recovered at Site 647 are of particular interest, as very little material of these ages has previously been recovered from the subarctic North Atlantic region, and virtually no descriptive work has been conducted on the more endemic components of the radiolarian assemblages from these time intervals. Thus, this report concentrates on providing, ... Dataset Baffin Bay Baffin Bay Baffin Greenland Greenland Sea Labrador Sea North Atlantic Subarctic PANGAEA - Data Publisher for Earth & Environmental Science Baffin Bay Greenland ENVELOPE(-48.369100,-45.262000,58.209300,53.331300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
105-646A 105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
105-646A 105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP Lazarus, David B Pallant, Amy Oligocene and Neogene radiolarians from the Labrador Sea |
topic_facet |
105-646A 105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Two sites in the Labrador Sea and one site in Baffin Bay were drilled during Leg 105. Radiolarians were recovered at all three sites, although at Site 645 (Baffin Bay), radiolarians were present in useful numbers only in the mudline sample. Radiolarians of late Neogene age were recovered at Site 646 south of Greenland, while early Oligocene and early Miocene radiolarians were recovered from the Labrador Sea at Site 647. In Site 646, radiolarian and other coarse-fraction abundances vary dramatically from sample to sample and may reflect deep-water depositional processes as well as changes in surface-water conditions. Site 647 siliceous microfossils reach their peak abundance and preservation in Core 105-647A-25R and decline gradually upward into the lower Miocene (Cores 105-647A-13R and -14R). Siliceous microfossil abundances in counts of the > 38-µm Carbonate-free coarse fraction from the siliceous interval are correlated to each other, but not to the abundance of nonbiogenic coarse-fraction components. Radiolarian abundances in specimens per gram (but not diatom abundances) are correlated to bulk opal concentration and to the organic carbon content of the sediment. The abundance of radiolarians and other siliceous microfossils within the lower Oligocene to lower Miocene is interpreted as reflecting changes in surface-water productivity. With only a few exceptions, no stratigraphic indicator species were seen in samples from either Site 646 or Site 647. The absence of both tropical/subtropical and Norwegian-Greenland Sea stratigraphic forms is due to the dominance of subarctic North Atlantic taxa in Leg 105 assemblages. The early Oligocene and early Miocene assemblages recovered at Site 647 are of particular interest, as very little material of these ages has previously been recovered from the subarctic North Atlantic region, and virtually no descriptive work has been conducted on the more endemic components of the radiolarian assemblages from these time intervals. Thus, this report concentrates on providing, ... |
format |
Dataset |
author |
Lazarus, David B Pallant, Amy |
author_facet |
Lazarus, David B Pallant, Amy |
author_sort |
Lazarus, David B |
title |
Oligocene and Neogene radiolarians from the Labrador Sea |
title_short |
Oligocene and Neogene radiolarians from the Labrador Sea |
title_full |
Oligocene and Neogene radiolarians from the Labrador Sea |
title_fullStr |
Oligocene and Neogene radiolarians from the Labrador Sea |
title_full_unstemmed |
Oligocene and Neogene radiolarians from the Labrador Sea |
title_sort |
oligocene and neogene radiolarians from the labrador sea |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.744815 https://doi.org/10.1594/PANGAEA.744815 |
op_coverage |
MEDIAN LATITUDE: 54.550800 * MEDIAN LONGITUDE: -46.038775 * SOUTH-BOUND LATITUDE: 53.331300 * WEST-BOUND LONGITUDE: -48.369100 * NORTH-BOUND LATITUDE: 58.209300 * EAST-BOUND LONGITUDE: -45.262000 * DATE/TIME START: 1985-10-03T05:45:00 * DATE/TIME END: 1985-10-23T18:15:00 |
long_lat |
ENVELOPE(-48.369100,-45.262000,58.209300,53.331300) |
geographic |
Baffin Bay Greenland |
geographic_facet |
Baffin Bay Greenland |
genre |
Baffin Bay Baffin Bay Baffin Greenland Greenland Sea Labrador Sea North Atlantic Subarctic |
genre_facet |
Baffin Bay Baffin Bay Baffin Greenland Greenland Sea Labrador Sea North Atlantic Subarctic |
op_source |
Supplement to: Lazarus, David B; Pallant, Amy (1989): Oligocene and Neogene radiolarians from the Labrador Sea: ODP Leg 105. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 349-380, https://doi.org/10.2973/odp.proc.sr.105.125.1989 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.744815 https://doi.org/10.1594/PANGAEA.744815 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.744815 https://doi.org/10.2973/odp.proc.sr.105.125.1989 |
_version_ |
1766365363651477504 |